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首页> 外文期刊>Journal of Iron and Steel Research International >Effect of Laser Power on Microstructure and Wear Resistance of WC_P/Ni Cermet Coating
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Effect of Laser Power on Microstructure and Wear Resistance of WC_P/Ni Cermet Coating

机译：激光功率对WC_P / Ni金属陶瓷涂层组织和耐磨性的影响

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摘要

Laser cladding nickel-based alloy coating (Ni60) and nickel-based composite coating doped with WC particles by 35 percent (WCp/Ni) were produced on the low-carbon steel substrate by CO_2 continuous wave laser with power of 5 kW using the injected powder technique. The effect of laser power on microstructure and wear resistance of laser cladding WC_P/Ni cermet coating was investigated. The WC_P/Ni alloy coating with evenly distributed WC ceramic phases and the better bond with the substrate alloy was obtained at a power of 2. 2 kW. Diffusion solution reaction happened between WC particles and the substrate alloy during laser cladding, and led to the formation of block rich-tungsten carbide on the edges of the WC particles, especially at higher power. The WC_P/Ni alloy coating consists of the undissolved WC particles, the block or dendritic rich-tungsten carbide, the bar-like rich-chromium carbide, and dendrite solid solution and eutectic structure among the carbides. Microhardness and wear resistance of the WCp/Ni coating at different powers were much higher or better than those of Ni60 alloy coating, and the best results were obtained at power of 2. 2 kW.
机译：在低碳钢基材上，通过注入功率为5 kW的CO_2连续波激光，在低碳钢基材上制备了激光熔覆镍基合金涂层（Ni60）和掺有WC颗粒（WCp / Ni）35％的镍基复合涂层。粉末技术。研究了激光功率对WC_P / Ni金属陶瓷熔覆层组织和耐磨性的影响。以2. 2 kW的功率获得了WC_P / Ni合金涂层，该涂层具有均匀分布的WC陶瓷相，并且与基体合金的结合更好。在激光熔覆过程中，WC颗粒与基体合金之间发生了扩散溶液反应，并导致在WC颗粒的边缘形成块状富钨碳化物，特别是在较高功率下。 WC_P / Ni合金涂层由未溶解的WC颗粒，块状或树枝状富钨碳化物，棒状富铬碳化物以及碳化物中的枝晶固溶体和共晶结构组成。 WCp / Ni涂层在不同功率下的显微硬度和耐磨性远高于或优于Ni60合金涂层，在2. 2 kW的功率下可获得最佳结果。

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